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Nitrate and Chloride Movement in the Plainfield Loamy Sand Under Intensive Irrigation¹

ABSTRACT

A field experiment to evaluate leaching under intensive irrigation was conducted over an 11-day period on a Plainfield loamy sand fertilized with KNO₃ and KCl. The NO₃-N and Cl concentration in soil profile and lysimeter leachate samples collected daily were determined. Under the conditions of this experiment 2.5 cm of water moved about 19 cm in the surface and 28 cm in the subsurface soil. Chloride concentrations in the profiles were similar to those of NO₃-N. Movement of NO₃-N and Cl was 15 to 20 cm/day under 2.5 cm daily water application. The results show that rainfall and/or irrigation, can rapidly move NO₃-N beyond the rooting zone of this soil.

Key Words: ground water pollution • leaching • miscible displacement • nitrogen fertilizers

¹ Research supported by the College of Agricultural and Life Sciences, and College of Engineering, and by a research grant from the National Science Foundation to the University of Wisconsin Institute for Environmental Studies.

² Research Assistant, Department of Chemical Engineering, Associate Professor, Visiting Assistant Professor, and Research Assistant; respectively, Dept. of Soil Science University of Wisconsin, Madison, 53706. F. J. Endelman is now with the Oak Ridge National Laboratory, Oak Ridge, Tenn. 37830; J. T. Gilmour is now Assistant Professor of Agronomy, University of Arkansas, Fayetteville, 72701.

Received for publication October 26, 1973.

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